INTRODUCTION If an electric current flows through a conductor in a magnetic field‚ the magnetic field exerts a transverse force on the moving charge carrier which tends to push them to one side of the conductor. A buildup of charge at the sides of the conductors will balance this magnetic influence‚ producing a measurable voltage between the two sides of the conductor. This presence of measurable transverse voltage is the Hall Effect. The Hall effect was discovered in 1879 by Edwin Herbert Hall
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book “Optics” by Hecht sections 3.2 and 3.3 Speed of light: EM waves travel in a vacuum with speed c = c = 299‚792‚458 ms-1 exactly They are transverse waves with (vector) E and B field orthogonal to each other‚ for this section bold indicates vector quanties. When far from the source (many wavelengths) the E and B fields are in phase The vector E x B points in the direction of motion Travelling waves can be written as E = E 0 ⋅ ei ( kx −ωt ) and B = B 0 ⋅ ei ( kx −ωt ) 1 µ 0ε 0 Magnitude of B and
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3.3.3 In Class or Homework Exercise 1. The rectangular loop below is being pulled to the right‚ out of the magnetic field which points inward as shown. In what direction is the induced current? No current is induced in the top or bottom wire‚ since they are moving parallel to themselves. The only current induced is in the left wire‚ where the current is induced upward. The result will be a clockwise current. 2. If the solenoid below is being pulled away from the loop shown‚ in what direction
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theorems‚ as well as a reminder of the differential equation that describes wave motion. The two mathematical theorems that we need to remind ourselves of are: The surface integral of a vector field over a closed surface is equal to the volume integral of its divergence. The line integral of a vector field around a closed plane curve is equal to the surface integral of its curl. There are four basic equations‚ called Maxwell equations‚ which form the axioms of electrodynamics. The so called local
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Zoo Virtual Field Trip Katherine A. Cottrell Liberty University EDUC 500 Zoo Virtual Field Trip In today’s technology age‚ virtual field trips can provide cognitive and affective gains similar to those of a real-life study trip. Field trips taken online can transport students to locations too far away to travel and are cost effective for the school district and parents as well. Teachers can guide and interact with all students in the class for the duration of the virtual field trip‚ which
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For the field observation‚ I went to Friends of crown heights educational center. Friend of Crown Heights is a Universal Pre-kindergarten program. This program prepares 4 year olds with language‚ literacy‚ cognitive‚ physical and social skill needed to excel in Kindergarten. The school was very welcoming. The teachers and staff were helpful and the students were friendly. In the classroom‚ I was assigned to observe there were three teachers and about 15 kids; mostly all girls. The classroom was made
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the unique Hamiltonian dynamical systems on spaces of Pfaff dimension 3‚ and the Master equations describe reversible processes on the symplectic manifold of Pfaff dimension 4. Irreversible processes generate dynamical systems proportional to vector fields ÝExA + Bd‚ A 6 BÞ‚ on symplectic domains of Pfaff dimension 4. THIS ARTICLE IS UNDER RE-CONSTRUCTION (10/18/97) (Suggestions are appreciated) INTRODUCTION In this article‚ Classical Electromagnetism will be defined in terms of two topological
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potential—creating an electric field)‚ thus emerging with kinetic energy‚ K‚ equal to the product of the electron’s charge‚ e‚ and the voltage‚ V (potential difference). Assuming they are emitted with negligible energy‚ where m is the mass of the electron‚ in this case. After emerging from the hole in the anode‚ the electrons enter a region with no electric fields‚ therefore then traveling at a constant velocity. The beam’s path is illuminated due to the ionization of the gas. A magnetic field is applied to
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in many forms. Electric energy can be converted into useful work‚ or mechanical energy‚ by machines called electric motors. Electric motors work due to electromagnetic interactions: the interaction ofcurrent (the flow of electrons) and a magnetic field. Problem Find out how to make a simple electric motor. Materials Needed D battery Insulated 22G wire 2 large-eyed‚ long‚ metal sewing needles (the eyes must be large enough to fit the wire through) Modeling clay Electrical tape Hobby knife
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repel one another in a similar way and always come in pairs: every north pole is yoked to a south pole. 3. An electric current in a wire creates a circular magnetic field around the wire‚ its direction depending on that of the current. 4. A current is induced in a loop of wire when it is moved towards or away from a magnetic field‚ or a magnet is moved towards or away from it‚ the direction of current depending on that of the movement. While preparing for an evening lecture on 21 April 1820‚ Hans
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